drive a coach and horses through something
idiomPart ofdrive
drive a coach and horses through something — idiom
1. To completely ruin or make a plan or system fail, often by finding a flaw.
1.idiom
Definition
To completely ruin or make a plan or system fail, often by finding a flaw.
Example
The new evidence drove a coach and horses through the prosecution's case.
Her clever argument drove a coach and horses through his business proposal.